nyunyu Necklace Heart Purchased at a store called nyunyu in Korea for about 4000 won. Only tried on once. The back of the heart and a part of the chain were slightly discolored (black) from the time of purchase (please check the second photo). It's barely noticeable when worn. The color is copper gold (close to the color of copper). We can also sell this as a set with other accessories, so please let us know.